27:05

24 - Intersections and sums of subspaces

25:41

The deeper meaning of matrix transpose

4:27

挺拔小课堂：后仰么 不存在的, 男人不狠地位不稳, 林诗栋 反手详解

23:02

What is the free vector space??

9:07

Quotients of Vector Spaces

15:57

The Big Picture of Linear Algebra

29:22

25 - Direct sums of subspaces

15:00

Euclidean vector space is direct sum of subspace and orthogonal complement (theorem & proof & notes)